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Abstract This paper describes a search for events with one top-quark and large missing transverse momentum in the final state. Data collected during 2015 and 2016 by the ATLAS experiment from 13 TeV proton–proton collisions at the LHC corresponding to an integrated luminosity of 36.1 fb−1 are used. Two channels are considered, depending on the leptonic or the hadronic decays of the W boson from the...

Inclusive and differential cross-sections for the production of a top-quark pair in association with a photon are measured with proton-proton collision data corresponding to an integrated luminosity of 36.1 $$\text{ fb }^{-1}$$ fb-1 , collected by the ATLAS detector at the LHC in 2015 and 2016 at a centre-of-mass energy of 13 $$\text {TeV}$$ TeV . The measurements are performed in single-lepton and...

The performance of identification algorithms (“taggers”) for hadronically decaying top quarks and W bosons in pp collisions at $$\sqrt{s}$$ s = 13 TeV recorded by the ATLAS experiment at the Large Hadron Collider is presented. A set of techniques based on jet shape observables are studied to determine a set of optimal cut-based taggers for use in physics analyses. The studies are extended to assess...

It has been found that the theoretical predictions for W and Z boson cross sections, and for the W boson charge asymmetry, which are labelled as NNPDF3.1 [1] have in fact been calculated using the NNPDF3.0 PDF set [2] instead.

Abstract A study of the decays Bs0 → μ+μ− and B0 → μ+μ− has been performed using 26.3 fb−1 of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in μ+μ− invariant mass is comparable to the Bs0 -B0 mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction...

Abstract The ratio of the cross sections for inclusive isolated-photon production in pp collisions at centre-of-mass energies of 13 and 8 TeV is measured using the ATLAS detector at the LHC. The integrated luminosities of the 13 TeV and 8 TeV datasets are 3.2 fb−1 and 20.2 fb−1, respectively. The ratio is measured as a function of the photon transverse energy in different regions of the photon pseudorapidity...

Abstract A search for Higgs boson pair production in the b b ¯ W W * $$ b\overline{b}W{W}^{*} $$ decay mode is performed in the b b ¯ ℓνqq $$ b\overline{b}\mathit{\ell \nu qq} $$ final state using 36.1 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of events beyond the background...

Abstract A measurement of the four-lepton invariant mass spectrum is made with the ATLAS detector, using an integrated luminosity of 36.1 fb−1 of proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV delivered by the Large Hadron Collider. The differential cross-section is measured for events containing two same-flavour opposite-sign lepton pairs. It exhibits a rich structure, with different...

Abstract This paper presents measurements of t t ¯ $$ t\overline{t} $$ production in association with additional b-jets in pp collisions at the LHC at a centre-of-mass energy of 13 TeV. The data were recorded with the ATLAS detector and correspond to an integrated luminosity of 36.1 fb−1. Fiducial cross-section measurements are performed in the dilepton and lepton-plus-jets t t ¯ $$...

The top quark mass is measured using a template method in the $$t\bar{t} \rightarrow \mathrm {lepton+jets}$$ tt¯→lepton+jets channel (lepton is e or $$\mu $$ μ ) using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton–proton centre-of-mass energy of $${\sqrt{s}} =8$$ s=8 $$\text {TeV}$$ TeV and correspond to an integrated luminosity of $$20.2$$ 20.2 fb$$^{-1}$$ -1 . The...

The efficiency of the photon identification criteria in the ATLAS detector is measured using $$36.1\hbox { fb}^1$$ 36.1fb1 to $$36.7\hbox { fb}^1$$ 36.7fb1 of pp collision data at $$\sqrt{s} = \hbox {13 TeV}$$ s=13 TeV collected in 2015 and 2016. The efficiencies are measured separately for converted and unconverted isolated photons, in four different pseudorapidity regions, for transverse momenta...

The response of the ATLAS detector to large-radius jets is measured in situ using 36.2 fb$$^{-1}$$ -1 of $$\sqrt{s}=13$$ s=13 TeV proton–proton collisions provided by the LHC and recorded by the ATLAS experiment during 2015 and 2016. The jet energy scale is measured in events where the jet recoils against a reference object, which can be either a calibrated photon, a reconstructed Z boson, or a...

Measurements of fiducial integrated and differential cross sections for inclusive $$W^+$$ W+ , $$W^-$$ W- and Z boson production are reported. They are based on $$25.0 \pm 0.5\; \mathrm {pb}^{-1}$$ 25.0±0.5pb-1 of pp collision data at $$\sqrt{s} = 5.02$$ s=5.02 TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Electron and muon decay channels are analysed, and the combined...

This paper describes a strategy for a general search used by the ATLAS Collaboration to find potential indications of new physics. Events are classified according to their final state into many event classes. For each event class an automated search algorithm tests whether the data are compatible with the Monte Carlo simulated expectation in several distributions sensitive to the effects of new physics...

A search for doubly charged scalar bosons decaying into W boson pairs is presented. It uses a data sample from proton–proton collisions corresponding to an integrated luminosity of 36.1 fb$$^\mathrm {-1}$$ -1 collected by the ATLAS detector at the LHC at a centre-of-mass energy of 13 TeV in 2015 and 2016. This search is guided by a model that includes an extension of the Higgs sector through a scalar...

Abstract A search for Higgs boson pair production in the b b ¯ b b ¯ $$ b\overline{b}b\overline{b} $$ final state is carried out with up to 36.1 fb−1 of LHC proton-proton collision data collected at s = 13 $$ \sqrt{s}=13 $$ TeV with the ATLAS detector in 2015 and 2016. Three benchmark signals are studied: a spin-2 graviton decaying into a Higgs boson pair, a scalar resonance decaying...

Abstract A search for heavy right-handed Majorana or Dirac neutrinos NR and heavy right-handed gauge bosons WR is performed in events with a pair of energetic electrons or muons, with the same or opposite electric charge, and two energetic jets. The events are selected from pp collision data with an integrated luminosity of 36.1 fb−1 collected by the ATLAS detector at s = 13 $$ \sqrt{s}=13...

Searches for non-resonant and resonant Higgs boson pair production are performed in the $$\gamma \gamma WW^*$$ γγWW∗ channel with the final state of $$\gamma \gamma \ell \nu jj$$ γγℓνjj using 36.1 $$\hbox {fb}^{-1}$$ fb-1 of proton–proton collision data recorded at a centre-of-mass energy of $$\sqrt{s}=$$ s= 13 TeV by the ATLAS detector at the Large Hadron Collider. No significant deviation from...

Measurements of the azimuthal anisotropy in lead–lead collisions at $$\sqrt{s_{_\text {NN}}}$$ sNN = 5.02 TeV are presented using a data sample corresponding to 0.49 $${\mathrm {nb}}^{-1}$$ nb-1 integrated luminosity collected by the ATLAS experiment at the LHC in 2015. The recorded minimum-bias sample is enhanced by triggers for “ultra-central” collisions, providing an opportunity to perform detailed...

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